keep patience to buy and sell your coins. it is the most important point in trading. you must have a strong emotional nature. you should be able to control the desire.
personally this is what I lack, 2 days back I sold
BTC @ $570 Rate & Now Rate has been Jumped to $552
Even if down to 552$ its really part of the trading, all just we need to do only is patience in trading. And all the time we must control our emotion while we do trade in the exchange platform. We must monitor it properly so we can able meet our desire in the trading platform.